[c-nsp] PPPoE in Routed environment and PPPoE web based Client

[Swaroop Potdar]

Its not possible to run PPPoE openly in a routed environment.
Assume even if we are successful in forwarding the broadcast discovery PADI.
to the Access Concentrator, the AC has to send a Offer back to the host.
Now to send this offer back it only has the host source MAC address.
Refer to the RFC 2516.
 
In a routed enviornmnet there is no MAC learning of remote segments.
 
So, you may want to extend the local broadcast segement till you AC by doing 
a PPPoE relay via L2TP. This link may come handy.
 
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804a40b7.html
 
HTH-Cheers,
Swaroop
 
 
 
-----Original Message----- 
From: Cisco Boy [mailto:firstccie at gmail.com] 
Sent: Wed 10/4/2006 5:00 AM 
To: Cisco-nsp 
Cc: 
Subject: [c-nsp] PPPoE in Routed environment and PPPoE web based Client




	Hi Gang,
	
	Just wondering if it's possible to run the PPPoE in routed environment.
	The scenario is below:
	----------------------
	
	    |-------------(LNS-7301)
	    | |-------------AAA-servers
	    | |
	Cat-6509----------100megs-----remote-site-A--------ME-3400-------PPPoE
	Client
	    |                                                                 
	                     |
	    |                                                                 
	                     |
	    |                                                                 
	                     |
	   
	|----------100megs-----------remote-site-B---------ME-3400-------PPPoE
	Client
	    |                                                                 
	                     | 
	    |                                                                 
	                     |
	   
	|----------100megs-----------remote-site-C---------ME-3400-------PPPoE
	Client
	
	Trying to figure out what is the best solution for this application.
	It's pretty much ring application. The goals are as below:
	
	a) ME-3400 should able to send the traffic using various path
	b) Best path selection - latency, traffic, hops etc
	c) PPPoE clients authentication in routed environment!!
	d) Do anyone know if there is a web-based client for PPPoE authentication?
	
	Couple of things in my mind:
	-----------------------------
	1) Is it possible to run PPPoE in routed environment?? Same problem was
	with DHCP in routed environment but there is a command "IP helper
	address" which solves DHCP issue.
	
	2) Running OSPF on all switches (routing) will provide the best path
	selection.
	
	3) Inter-VLAN routing - will forwared PPPoE packets and for load
	balancing run MSTP ???
	
	It's open for discussion.
	
	CiscoBOY
	
	
	
	
	
	
	
	
	
	
	
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